fix: 修复导航样式冲突 (#2307)

#### What this PR does / why we need it?

#### Summary of your change

#### Please indicate you've done the following:

- [ ] Made sure tests are passing and test coverage is added if needed.
- [ ] Made sure commit message follow the rule of [Conventional Commits specification](https://www.conventionalcommits.org/).
- [ ] Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

frontend/src/styles/element-dark.scss

@@ -180,11 +180,13 @@ html.dark {
 
     .router_card_button {
         .el-radio-button__inner {
-            background: none;
+            background: none !important;
         }
         .el-radio-button__original-radio:checked + .el-radio-button__inner {
             color: #ffffff;
+            background-color: var(--panel-button-active) !important;
             box-shadow: none !important;
+            border: none !important;
         }
     }
     // content-box